 In addition, Kahn also looked to improve the overall environment of the building by incorporating as much natural light in the building as possible.As a result, he incorporated five large 15 by 18 foot window openings that, when combined with the open sliding doors, allowed for natural light to reach about 40 percent of the total floor area of the hangar.Ford's dreams of Tri-Motor construction were hampered by the beginning of the Great Depression.